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초박형 카본쉘이 코팅된 금속간 화합물 합금 나노 입자로 구성된 연료전지용 산소 환원 반응 촉매
최현우,고건우,최윤성,민지호,김윤진,박범준,정남기,Hyeonwoo Choi,Keonwoo Ko,Yoonseong Choi,Jiho Min,Yunjin Kim,Sourabh Sunil Chougule,Khikmatulla Davletbaev,Chavan Abhishek Arjun,Beomjun Pak,Namgee Jung 한국재료학회 2024 한국재료학회지 Vol.34 No.4
To fabricate intermetallic nanoparticles with high oxygen reduction reaction activity, a high-temperature heat treatment of 700 to 1,000 ℃ is required. This heat treatment provides energy sufficient to induce an atomic rearrangement inside the alloy nanoparticles, increasing the mobility of particles, making them structurally unstable and causing a sintering phenomenon where they agglomerate together naturally. These problems cannot be avoided using a typical heat treatment process that only controls the gas atmosphere and temperature. In this study, as a strategy to overcome the limitations of the existing heat treatment process for the fabrication of intermetallic nanoparticles, we propose an interesting approach, to design a catalyst material structure for heat treatment rather than the process itself. In particular, we introduce a technology that first creates an intermetallic compound structure through a primary high-temperature heat treatment using random alloy particles coated with a carbon shell, and then establishes catalytic active sites by etching the carbon shell using a secondary heat treatment process. By using a carbon shell as a template, nanoparticles with an intermetallic structure can be kept very small while effectively controlling the catalytically active area, thereby creating an optimal alloy catalyst structure for fuel cells.